package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){

        log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //UUID
        String fileName = UUID.randomUUID().toString()+suffix;

        File dir = new File(basePath);
        if (!dir.exists()){
            dir.mkdir();
        }
        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath+fileName));
        }catch (IOException e){
            e.printStackTrace();
        }


        return R.success(fileName);

    }

    @GetMapping("/download")
    public void downLoad(String name, HttpServletResponse response){

        try {
            //输入流，读取文件数据
            FileInputStream inputStream = new FileInputStream(new File(basePath+name));
            //通过输出流，将文件写回浏览器，在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");
            int len = 0;
            byte [] bytes = new byte[1024];
            while ((len = inputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            inputStream.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
